Facebook is now Koobface-free, and security researchers have publicized information about the five perpetrators behind the massive botnet.

Security researchers have
publicly unmasked five people they believe are behind Koobface, a botnet that
spreads on social-networking sites and directs users to Websites selling fake
antivirus and other scams.
Facebook has been fighting
the malware for the past year and successfully took one of the
command-and-control servers controlling the botnet offline last March, the
social-networking site proclaimed Jan. 17 on the Facebook Security blog.
Facebook has been Koobface-free for more than nine months, according to the
post.

"Facebook Security was
able to perform a technical takedown of this 'Command & Control'
mothership," the company wrote.